threads: order topic chips newest-first beneath General

The gateway already stored a created timestamp per channel/thread but
never sent it over the wire. Now:

- protocol.py: _channel_payload() includes created (unix seconds)
- Protocol.kt: ChannelInfo.created (default 0.0 for legacy gateways)
- ChatScreen: topic switcher sorts threads created-desc (newest right
  after General, swipe new -> old), name as tie-break
- frames.schema.json: document the created field
- ChannelCreatedWireTest: wire deserialization + ordering tests

app/shared/src/commonMain/kotlin/iris/protocol/Protocol.kt

@@ -150,6 +150,9 @@ data class ChannelInfo(
     @SerialName("is_default") val isDefault: Boolean = false,
     @SerialName("parent_chat_id") val parentChatId: String? = null,
     val archived: Boolean = false,
+    /** Unix timestamp (seconds) when the channel/thread was created; 0.0 if
+     *  the gateway predates the field. Used to order threads newest-first. */
+    val created: Double = 0.0,
     /** Gateway minted this thread for an incoming message (auto-threading);
      *  the name is a derived title, upgraded by the LLM via channel.renamed. */
     val auto: Boolean = false,

app/shared/src/commonMain/kotlin/iris/ui/screens/ChatScreen.kt

@@ -175,7 +175,12 @@ fun ChatScreen(controller: IrisController) {
     val channels by controller.channels.channels.collectAsState()
     val (currentChatId, currentThreadId) = controller.chat.parseLane(currentLane)
     val currentChannel = channels.firstOrNull { it.chatId == currentChatId }
-    val threads = channels.filter { it.kind == "thread" && it.parentChatId == currentChatId }
+    // Threads newest-first (right after "General") so the user swipes from
+    // new to old; ties (e.g. created==0 from an old cache) fall back to name.
+    val threads =
+        channels
+            .filter { it.kind == "thread" && it.parentChatId == currentChatId }
+            .sortedWith(compareByDescending<ChannelInfo> { it.created }.thenBy { it.name.lowercase() })
 
     // M8: unread counts. Per-lane from the store; per-channel aggregated
     // (flat lane + all threads) for the drawer/rail badges.

app/shared/src/commonTest/kotlin/iris/protocol/ChannelCreatedWireTest.kt

@@ -0,0 +1,52 @@
+package iris.protocol
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+/** Wire tests for the channel directory `created` field (thread ordering). */
+class ChannelCreatedWireTest {
+    @Test
+    fun channelInfoDeserializesCreated() {
+        val raw =
+            """
+            {"v":1,"type":"channel.created","payload":{"chat_id":"t_9","name":"New topic",
+              "kind":"thread","parent_chat_id":"default","created":1787648374.37}}
+            """.trimIndent()
+        val frame = IrisJson.instance.decodeFromString(Frame.serializer(), raw)
+        val info = frame.payloadAs<ChannelInfo>()
+        assertEquals("t_9", info?.chatId)
+        assertEquals(1787648374.37, info?.created)
+    }
+
+    @Test
+    fun channelInfoDefaultsCreatedToZero() {
+        // Legacy gateways omit the field; the app falls back to name ordering.
+        val raw =
+            """{"v":1,"type":"channel.created","payload":{"chat_id":"t_1","name":"Old","kind":"thread"}}"""
+        val frame = IrisJson.instance.decodeFromString(Frame.serializer(), raw)
+        assertEquals(0.0, frame.payloadAs<ChannelInfo>()?.created)
+    }
+
+    @Test
+    fun threadsSortNewestFirst() {
+        // Mirrors the topic-switcher ordering in ChatScreen: created desc,
+        // name asc as the tie-break (e.g. for legacy entries with created==0).
+        val threads =
+            listOf(
+                ChannelInfo(chatId = "t_2", name = "Capital of Romania", kind = "thread", parentChatId = "default", created = 1787232736.0),
+                ChannelInfo(chatId = "t_1", name = "Capital of France", kind = "thread", parentChatId = "default", created = 1787232221.0),
+                ChannelInfo(
+                    chatId = "t_9",
+                    name = "Test file operations",
+                    kind = "thread",
+                    parentChatId = "default",
+                    created = 1787422924.0,
+                ),
+                ChannelInfo(chatId = "t_0", name = "Legacy b", kind = "thread", parentChatId = "default"),
+                ChannelInfo(chatId = "t_0a", name = "Legacy a", kind = "thread", parentChatId = "default"),
+            )
+        val ordered =
+            threads.sortedWith(compareByDescending<ChannelInfo> { it.created }.thenBy { it.name.lowercase() })
+        assertEquals(listOf("t_9", "t_2", "t_1", "t_0a", "t_0"), ordered.map { it.chatId })
+    }
+}

docs/protocol/frames.schema.json

@@ -97,7 +97,7 @@
   },
   "definitions": {
     "kind": { "type": "string", "enum": ["image", "audio", "video", "document", "voice"] },
-    "channel": { "type": "object", "properties": { "chat_id": {"type":"string"}, "name": {"type":"string"}, "kind": {"type":"string","enum":["default","channel","thread"]}, "parent_chat_id": {"type":["string","null"]}, "is_default": {"type":"boolean"}, "archived": {"type":"boolean"}, "auto": {"type":"boolean","description":"Optional; true on channel.created for a gateway-minted auto-thread."}, "favorite": {"type":"boolean","description":"Optional; cosmetic favorite flag (sorts to the top of the list)."}, "icon": {"type":["string","null"],"description":"Optional; cosmetic icon, a base64-encoded image (PNG/JPEG). Absent/null = auto-generated letter avatar."}, "color": {"type":["string","null"],"description":"Optional; cosmetic avatar color override (#RRGGBB). Absent/null = auto-generated name-hash color."}, "automation": {"type":"boolean","description":"Optional; true when the channel is an automation channel (read-only for the user; only receives gateway-originated output such as cron jobs and webhooks). The app hides the composer and the gateway rejects message.send into it. Never set on the default channel."} } },
+    "channel": { "type": "object", "properties": { "chat_id": {"type":"string"}, "name": {"type":"string"}, "kind": {"type":"string","enum":["default","channel","thread"]}, "parent_chat_id": {"type":["string","null"]}, "is_default": {"type":"boolean"}, "archived": {"type":"boolean"}, "created": {"type":"number","description":"Optional; unix timestamp (seconds) when the channel/thread was created. The app orders threads newest-first in the topic switcher."}, "auto": {"type":"boolean","description":"Optional; true on channel.created for a gateway-minted auto-thread."}, "favorite": {"type":"boolean","description":"Optional; cosmetic favorite flag (sorts to the top of the list)."}, "icon": {"type":["string","null"],"description":"Optional; cosmetic icon, a base64-encoded image (PNG/JPEG). Absent/null = auto-generated letter avatar."}, "color": {"type":["string","null"],"description":"Optional; cosmetic avatar color override (#RRGGBB). Absent/null = auto-generated name-hash color."}, "automation": {"type":"boolean","description":"Optional; true when the channel is an automation channel (read-only for the user; only receives gateway-originated output such as cron jobs and webhooks). The app hides the composer and the gateway rejects message.send into it. Never set on the default channel."} } },
     "media_ref": { "type": "object", "properties": { "media_id": {"type":"string"}, "kind": { "$ref": "#/definitions/kind" }, "mime": {"type":"string"}, "size": {"type":"integer"}, "filename": {"type":"string"}, "message_id": {"type":"string","description":"Optional; set on media.offer to associate the offer with the assistant message it belongs to."} } },
     "runtime": { "type": "object", "description": "Structured runtime-metadata footer (app-controlled display). The gateway ALWAYS sends it on final assistant messages; whether/what is shown is a per-app setting (Settings -> Runtime footer), NOT a hermes config. All keys optional; absent when the data is unavailable (e.g. local models have no cost).", "properties": { "model": {"type":"string","description":"Bare model id, vendor prefix dropped (gpt-5.4)."}, "context_pct": {"type":"integer","description":"Last-call context occupancy, 0-100."}, "cwd": {"type":"string","description":"Home-relative working dir (~)."}, "latency": {"type":"number","description":"Wall-clock turn duration, seconds."}, "cost": {"type":"number","description":"Turn cost, USD."} } }
   },

gateway-plugin/protocol.py

@@ -559,6 +559,8 @@ def _channel_payload(entry: dict[str, Any]) -> dict[str, Any]:
     }
     if entry.get("parent_chat_id") is not None:
         payload["parent_chat_id"] = entry["parent_chat_id"]
+    if entry.get("created"):
+        payload["created"] = entry["created"]
     if entry.get("is_default"):
         payload["is_default"] = True
     if entry.get("archived"):